1 John 2:2

2:2 and he himself is the atoning sacrifice ¹  for our sins, and not only for our sins but also for the whole world. ² 

1 John 5:6

5:6 Jesus Christ is the one who came by water and blood – not by the water only, but by the water and the blood. And the Spirit is the one who testifies, because ³  the Spirit is the truth.

[2:2]  ¹ tn A suitable English translation for this word (ἱλασμός, Jilasmos) is a difficult and even controversial problem. “Expiation,” “propitiation,” and “atonement” have all been suggested. L. Morris, in a study that has become central to discussions of this topic (The Apostolic Preaching of the Cross, 140), sees as an integral part of the meaning of the word (as in the other words in the ἱλάσκομαι [Jilaskomai] group) the idea of turning away the divine wrath, suggesting that “propitiation” is the closest English equivalent. It is certainly possible to see an averting of divine wrath in this context, where the sins of believers are in view and Jesus is said to be acting as Advocate on behalf of believers. R. E. Brown’s point (Epistles of John [AB], 220-21), that it is essentially cleansing from sin which is in view here and in the other use of the word in 4:10, is well taken, but the two connotations (averting wrath and cleansing) are not mutually exclusive and it is unlikely that the propitiatory aspect of Jesus’ work should be ruled out entirely in the usage in 2:2. Nevertheless, the English word “propitiation” is too technical to communicate to many modern readers, and a term like “atoning sacrifice” (given by Webster’s New International Dictionary as a definition of “propitiation”) is more appropriate here. Another term, “satisfaction,” might also convey the idea, but “satisfaction” in Roman Catholic theology is a technical term for the performance of the penance imposed by the priest on a penitent.

[2:2]  ² tn Many translations supply an understood repetition of the word “sins” here, thus: “but also for the sins of the whole world.”

[5:6]  ³ tn This ὅτι (Joti) is best understood (1) as causal. Some have taken it (2) as declarative, giving the content of the Spirit’s testimony: “and the Spirit is the One who testifies that the Spirit is the truth.” This is certainly possible, since a ὅτι clause following the cognate verb μαρτυρέω (marturevw) often gives the content of the testimony (cf. John 1:34; 3:28; 4:39, 44). But in the Gospel of John the Spirit never bears witness on his own behalf, but always on behalf of Jesus (John 15:26, 16:13). There are, in fact, some instances in the Gospel of John where a ὅτι clause following μαρτυρέω is causal (8:14, 15:27), and that is more likely here: “and the Spirit is the One who testifies, because the Spirit is the truth.”